writing my own OS.....where to start from??

Have look here, you may get something.....

http://www.cse.ogi.edu/class/cse526/Reading%20List.html


http://www.nondot.org/sabre/os/articles

http://www.memorymanagement.org

http://www.williamstallings.com/OS4e.html

Tutorial for OS writers (but in Russian ): hxxp://www.codenet.ru/progr/os/intro.php

If you interesting in "Realtime Operating Systems. Concepts and Implementation of Microkernels for Embedded Systems." by Dr. J��rgen Sauermann, Melanie Thelen, let me know. I'll send.

linux is a good example.

you should write some code switch to 32-bit model(in x86 pc).

i think you can find MSDOS source in internet, it will good work for u. because linux is full of difficulties which one is not good at it.
I found it is http://www.driverdevelop.com/dlit.php?id=272, but it require access. good lucky for u.

[JMI]

Actually, the DOS source is also on the FTP, if one has access, which loman should.

Regards,

[TQN]

You can see MenuetOS, a open source 32bit OS and free FASM source code.